Should I learn Maya because it is superior to Blender in animation?
This question might seem opinion based and therefore not suitable for this platform and I think it actually might be the case. However, I think it is possible to answer it based on facts, or maybe I should say the absence of facts that you should learn Maya instead of Blender or that one of them is superior in animation as a whole. 

I can say with certainty that there are no rules or laws that would force you to learn any 3d software instead of another. Blender is free so you definitely do not have any restrictions choosing it instead of any other package. It has all the tools to make animations, and there are studios that use it even for animated feature films and they seem to be happy with Blender instead of Maya. Tangent Labs with their Next Gen is a famous great example.  

I think the answer to your question is: no, you shouldn't, meaning you can but do not have to. You can choose whatever you wish.